Leviticus 26:35-36

35As long as it lies desolate, the land will have the rest it did not receive during the Sabbaths when you lived in it.

36As for those of you who survive, I will send a faintness into their hearts in the lands of their enemies, so that even the sound of a windblown leaf will put them to flight. And they will flee as one flees the sword, and fall when no one pursues them.